48 Mr. G. S. Brady on Ostracoda 



half the length ; anterior extremity evenly, posterior obliquely 

 rounded : superior margin slightly concave in the middle, 

 and more distinctly emarginate close to the posterior extre- 

 mity ; inferior rather deeply sinuated in the middle. Out- 

 line, as seen from above, oblong, irregularly ovate, widest 

 behind the middle, obtusely pointed in front, broadly mucro- 

 nate behind ; greatest width less than the height. Surface 

 of the valves irregularly pitted, marked with several peri- 

 pheral concentric rugfe and an indistinct transverse central 

 sulcus. Colour yellowish brown. Length -^ inch. 



Cythere Stinipsoni, Brady. (PL VII. figs. 9-12.) 



Cythere Stimpsoni, Brady, Les Fonds de la Mer. 



This species exhibits a near approach to C. fistulosa, Baird, 

 and seems to be separated from that species chiefly by its less 

 abrupt and prominent ribbing, the more delicate reticula- 

 tion of the surface, and the less elongated form of the cara- 

 pace. C. runcinata, Baird, seems to me very likely to be the 

 male of C. Jistulosa. 



Loxoconcha tumida, nov. sp. (PI. VIII. figs. 11, 12.) 



Carapace of the female, as seen from the side, subrhomboidal, 

 highest in the middle ; greatest height equal to more than 

 two-thirds of the length ; extremities obliquely rounded, 

 the posterior emarginate at its upper extremity : superior 

 margin arched, highest in the middle ; inferior slightly 

 convex. Seen from above, the outline is lozenge-shaped, 

 widest at the middle and acuminate at each extremity ; 

 width equalling rather more than half the length. Shell- 

 surface closely and rather coarsely punctate. Length 

 ihr inch. 

 This is closely allied to L. affinis, but much more tumid. 



Loxoconcha angustata, nov. sp. (PL VIII. figs. 16, 17.) 



Carapace, as seen from the side, elongated, subrhomboidal, 

 nearly equal in height throughout ; height equal to half the 

 length ; extremities obliquely rounded, the posterior emar- 

 ginate at its upper angle : superior margin quite straight, 

 inferior slightly sinuated. Outline, as seen from above, 

 ovate, widest behind the middle ; extremities sharply mu- 

 cronate, greatest width about equal to the height. Shell- 

 surface marked with closely set, deep, angular pittings. 

 Substance of the shell rather thin and horny. Length 

 ■A inch. 



